Revert "Revert "Revert "D3D练习程序"""

This reverts commit e728423092806fd4893bb045a3c2f2d2826c659f.
Revert "Revert "Revert "Revert "D3D练习程序""""

This reverts commit 2cbf7846dd13a35f1cdb8c64665d90b3a7a7b438.
Revert "Revert "Revert "Revert "Revert "D3D练习程序"""""

This reverts commit 8884114a0b6581f81655bd5d0e46ce03da35824e.
Triangle